Home Tube DIY Asylum

Do It Yourself (DIY) paradise for tube and SET project builders.

[ Follow Ups ] [ Post Followup ] Thread: [ Display  All  Email ] [ Tube DIY Asylum ]
[ Alert Moderator ]

Use a MOSFET or SCR

Then you can have a low voltage switch to turn on the high voltage. Or better yet a timer circuit and no switch to worry about. Since the MOSFET or SCR is hard on, you don't need much heatsinking either as you would in a series pass regulator.

Don't get caught up in the "sand sound" debate. The MOSFET will have 3 ohms or less on resistance. How is that an issue at 300v+ ? Likewise an SCR will drop 0.7 volts - not an issue either. And this is not a series pass regulator application where the output impedance varies. A solid state B+ switch will impart "no sonic signature" or other audiophile ills.

One caveat with an SCR, you can't turn the HV back off with the "HV switch" once it's turned on. Ypu must power down the amp to break the current flow through the SCR to turn it off - basic SCR theory.

Another plus of the SCR is you could use a momentary switch. Once latched, the SCR stays on. That was you can;t accidentally leave the B+ switch on when the whole amp is turned off.

This post is made possible by the generous support of people like you and our sponsors:
  Amplified Parts  

Follow Ups Full Thread
Follow Ups
FAQ

Post a Message!

 Forgot Password?
Moniker (Username):
Password (Optional):
  Remember my Moniker & Password  (What's this?)    Eat Me
E-Mail (Optional):
Subject:
Message:   (Posts are subject to Content Rules)
Optional Link URL:
Optional Link Title:
Optional Image URL:
Upload Image:
E-mail Replies:  Automagically notify you when someone responds.

[ Top Top of Page ] [ Contact Us ] [ Support/Wish List ] [ Copyright © 2024, Audio Asylum, all rights reserved ]
[ General ] [ Speakers ] [ Tubes ] [ Vinyl ] [ Digital ] [ Hi-Rez ] [ Video Asylum ] [ Cables ] [ Tweaks/DIY ] [ Music ] [ Films ]